Improvement in steam-generators



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WILLIAM B. MACK, or DETROIT, MICHIGAN.

Letters Patent No. 97 ,505, dated November 30, 18.69; antedateal 'November lll, 1869.

IMPROVEMENT IN STEAM-GENERATORS.

The' Schedule referred-to in these LettersrPatent and making part of the same.

`I, WILLI-AM vB. MACK, of the city of Detroit, in the county of Wayne, and in the State of Michigan, have invented a Circulator-.Attachment to Steam-Boilers, ,of which the following is a specification.

My invention relates to that class of steam-gener- Y ators in which the re -is applied directly to a secondary chamber., between which and the main chamber a. circulation is'kept nplby suitably-arranged connections', as hereinafter shown; and A The invention consists in constructing-this secondary chamber or circulator-attachment in, such a way that the water is made to pursue a circuitous route in passing from the inlet-pipe or :pipes to the eduction or retnrn-pipe, by-means of divisional bars, which separate the space between the upper and lower sheets in the circulator-ebamber into communicating compartments, substantially as shown in the drawing, and

which, at the same time, serve as stays or supports for strengthening the structure. v

Description of the Accompanying Drawings.

Figure l represents the circulator-attacln'nent when completed and put together.

` Figure 2 represents the sectional view of the circulator, showing the current water passing through the circulator. y

General Description. The circulator is in semi-cylindrical form, and the Itire to heat the water passing through the -circulator is to be built within the cavity ofits arch.

' A are the angle-irons, which enclose and unitethe' two sheets, B and O, at theirouter edges.

B isthe inside, and` O the outside plate or casing of the circulator.

Dare the pipes by which the water is introduced from the boiler to the circulator.

l E represents the pipe or tube by which the water, after having .passed through the circulator, is again returned tothe boiler.

-Gr are the bars or stays, which are closely fitted, by 4 rivets, between B and C, and around which the water circulates, as shown by'arrows Vin fig. 2. p

It will be necessary to make the plate or sheeting B much heavier, stronger, and of better material than plate or sheeting C.

Claim.. 

